Wearing plate for crushers



Sept. 9, 1924.

- C/G. BUCHANAN WEARING PLATE FOR CRUSHERS HVVENTOR $45 @WMM Filed June l0,'1922 I u/iv f%zji;ub

% ATTORNEYS V Patented Sept. 9, 1924. V

ontAnLEs e. BUCHANAN, on EAST ORANGE, NEW JERSEY. 1

-wnanrne PLATE non causnnns.

Application filed June 10, 1922. Serial No. 567,258.

To (ll/Z 'w/wmit may concern:

Be it known that I, CHARLES G. BUCHAN- AN, a citizen of the United States, residing at East Orange, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Wearing Plates for Crushers, of which the following is a specification.

This invention relates to crushers and particularly to the replaceable plates form ing the wearing surfaces of the jaws of.

rock and ore crushers and the like. Such wear plates are often sub ected to extremely high pressures incident to crushing very strongly resistant substances, and are usually formed of an' alloy such as manganese steel of great hardness. This material is very expensive audit is highly important to have it-last' as long as possible and to avoid thenecessity of frequently replacing the plates'worn in S81V106.. It is also desirable to clamp the wearing plates in such a? manner as to permit expansion or flow of the material under the heavy strain of service without developing a resistance of' the clamping means to this movement because any such resistance tends to cause distortionand weakening of the plates.

The object of this invention is to provide wearing plates assembled together and fastened to the supporting crusher member in such manner as to be free for expansion in all directions and detachable and reversible in highly variable manner permitting a large number of different plate areas to be exposed at the point of greatest wear.

In this way the plates are protected from warping, and the wear may be distributed over all surfaces of the plates by simply re-. positioning the plates as wear develops at any point.

In the accompanying drawings illustrating' the invention- 7 Fig. 1 is a face view of a crusher jaw provided with replaceable wearing plates.

Fig. 2 is a side view of the jaw shown in Fig. 1 with parts in section.

Fig. 3 is a sectional view of a portion of one of the wearing plates.

Fig. i is a sectional view of a portion of Fig. 2 illustrating a modification, and

Fig. 5 is a View similar to Fig. l but illustrating a modified construction.

In the specific embodiment of the invention shown in the drawings a crusher jaw J adapted to oscillate around the center of a trunnion? moves clockwise (Fig. 2) du'r ing the crushing stroke, a toggle mechanism or similar operating means engaging the crusher jaw at the recessS and pressingthe jaw against-the material to be crushed. The face of the J is provided with replace able wearing plates 9 and'10 of generally rectangular form and having machined inner surfaces 11 and12 engaging the jaw surfaces. Tongues or ribsl and 15 on said plates 9, 10 fit in corresponding grooves in the-surface of the jaw J to hold the plates; I

against lateral movement. Each end of-each plateis notched out as shown at 16 and the bottomof the notch is provided with a beveled surface 17 adapted'to be engaged by' the correspondingly beveled "surface of wedge. blocl 18 drawn inward by the bolt 19 passing through to the backof the jaw.

jaw to engage the opposite sides of the end wedge blocks 18 and with the parts in the position shown in Figs. 1 ,and 2 drawing are spaced apart by clearance 26. Thus the plates are firmly supported against the face of the jaw J and clamped in place'by hold ing pressure applied at the center, leaving the plates free to expand inv any direction without resistance and without the development of opposing clamping pressures likely to cause buckling or warping of the plates.

In practice it has been found that the plates tend to wear especially at the center forming a central vertical trough and at the'lower end of the lower plate. With the structure of this invention the worn portion may be readily renewed simply by releasing the lower plate and reversing it end for end. The worn surface may again be renewed by interchanging the positions of the plates 9 and 10 and again by reversing the plate 9 in its new position. The'troughing at the center may also be renewed wherethere are plates side by side as in Fig. 5 by either turning these plates up side down or interchanging them laterally so as, to bring the 75 Beveled surfaces 20, 21 are provided on the unworn outer edge at the center. In all of these interchanges it is. only necessary to release the wedge clamping means and shift the plates as desired as the plates are exact duplicates of each other and cooperate in the same manner with the clamping means.

Instead of forming the clamping means as a separate wedge block 18 and bolt 19 the head of the bolt 19 (Fig. l) may be shaped as a wedge 18.

In Fig. 5 a modified structure is shown in which the wearing surface of jaw J is formed by six detachable plates arranged in two vertical rows of three plates each and fastened in place by wedge and bolt means 31 similar to the wedge and bolt means 18,.

19 shown in Figs. 1 and 2 clearances 26 be ing provided all around. Since there are two positions of wear for each plate 30 and each plate is insertable in any of the six positions twelve readjustments of th wearing surface are possible with the resulting complete distribution of the wear over all of the plates.

In the crusher surfacing means of this invention the manganese steel is gripped and held in such a way that the expansion of the steel takes place chiefly in directions away from the beveled surfaces engaged by the gripping means. always remain undistributed and in alinement on the opposite end of the plate so as to be perfectly reversible and insertable in any of the gripping means. plates are large two holding wedges instead of one may be used in each end of each plate These surfaces therefore lVhere the expansion of the plate in all directions, a:

central tongue member adapted to hold'the plate centrally against shifting and permit expansion of said plate in all directions,and

separated surfaces at the edges of the plateformed to be gripped by holding means. at such separated points on opposite edges to hold the plate against the supporting surfacewhile permitting its expansion thereon in service.

2. In a-jaw fora crusher in combination a. reversible wearing plate composed of 'ma terial adapted 'toflow under pressure and comprising a generally rectangular body having a back surface adapted to permit expansion of the plate in all directions, means holding the plate against shifting and separated gripped surfaces at the edges of the plate, and holding means gripping said se arated surfaces at'opposite edges to ho d the plate against the supporting surface in its original or a reversed position and. permitting its expansion in service.

CHARLES G. BUCHANAN; 

